Appendix B is a one-page instruction set on how to activate your free online mock exam subscription - yes, this is totally free. I've tried to design the simulator to look and feel like the real Sun exams, and the mock will contain 69 questions and give you 135 minutes just like the real thing! The mock is supposed to allow you to assess your overall performance after finishing all the chapters, rather than your assessment of each individual chapter. A slight technical delay means the simulator probably won't be ready and tested until next week however.